Coronary Angiography Coronary angiograms at baseline, immediately after PCI, and at 6 months will be performed in at least 2 orthogonal views after intracoronary nitroglycerin. Minimum lumen diameter (MLD) and mean reference diameter (RD), obtained by averaging 5-mm segments proximal and distal to the target lesion location, will be used to calculate diameter stenosis as follows: (1-MLD/RD)X100. Late loss will the change in MLD from final PCI to follow-up. In-stent analysis will be confined to the stent itself, and in-segment analysis will be included the stent plus 5-mm segments proximal and distal to the stent. Binary restenosis will be defined as a <50% diameter stenosis. Qualitative analysis will be done with standard published methods.